Class RDbColWriteStream

RDbColWriteStream

Support

Supported from 5.0

Description

Writes Long columns when inserting or updating rows in a rowset.

Only one column in a rowset object can be opened for writing as a stream at a time.

Derivation

RDbColWriteStream Writes Long columns when inserting or updating rows in a rowset RWriteStream The write stream interface

Defined in RDbColWriteStream:
OpenL(), OpenLC(), RDbColWriteStream()

Inherited from RWriteStream:
Attach(), Close(), CommitL(), Detach(), Pop(), PushL(), Release(), Sink(), WriteInt16L(), WriteInt32L(), WriteInt8L(), WriteL(), WriteReal32L(), WriteReal64L(), WriteUint16L(), WriteUint32L(), WriteUint8L()

RDbColWriteStream();

Description

Constructs this object by invoking the default constructor for RWriteStream.

RDbColWriteStream(const MExternalizer<TStreamRef>& anExternalizer);

Description

Constructs this object by invoking the matching constructor for RWriteStream.

Parameters

const MExternalizer<TStreamRef> &anExternalizer Specifies an externaliser

void OpenL(RDbRowSet& aView,TDbColNo aCol);

Description

Opens the column with the specified ordinal in the current row, and in the specified rowset, and prepares the column for being written or replaced. The rowset must be updating or inserting a row.

Parameters

RDbRowSet& aView The rowset which has the row and column to be written. TDbColNo aCol The column ordinal of the column to be written.

Leave codes

The function can leave with one of the DBMS database error codes.

void OpenLC(RDbRowSet& aView,TDbColNo aCol);

Description

Opens the column with the specified ordinal in the current row, and in the specified rowset, and prepares the column for being written or replaced, putting a cleanup item for this object onto the cleanup stack. The rowset must be updating or inserting a row.

Placing the cleanup object on the cleanup stack allows allocated resources to be cleaned up if a subsequent leave occurs.

Parameters

RDbRowSet& aView The rowset which has the row and column to be written. TDbColNo aCol The column ordinal of the column to be written.

Leave codes

The function can leave with one of the DBMS database error codes.